Incident Energy Dependence of Isotopic Yield Distributions of Target-like and Fission-like Products in ¹⁴Ν Induced Reaction on ⁶²Νi

Abstract

Incident energy dependence of isotopie yield distributions of target-like and fission-like products was studied in the heavy-ion reaction of 14 N on "Ni by the radiochemical method. Cobalt and scandium isotopes were chosen as samples of the former and the latter products, respectively, and the energy range covered was 70 to 122 MeV. Formation cross-sections of cobalt and scandium isotopes were found to increase with increasing energy, and their isotopie yield distributions could be fitted by a Gaussian function for the energy region greater than 70 MeV. The most probable N/Z ratio for cobalt isotopes fell between the Ν¡Z ratio of the compound nucleus and the target nucleus, but it was smaller than that of the compound nucleus for scandium isotopes. The formation cross-sections of cobalt isotopes showed the Qgg dependence, except for those of 60 Co. The nuclear temperature deduced from Q gg dependence was independent of the incident energy. Both the excitation functions and the recoil study of scandium isotopes support the proposition that they are produced by fission of a fully equilibrated system.